Hi Kashyap,
Thanks for your reply, and I am sorry for lack of information.
I am using mpt fusion driver version 3.04.10.
What setup information do you need?
My PC consists of two Intel Quad-core Xeon E5430 2.66~GHz, Intel 5100 chipset,
and 4 GB memory (DDR2-667). OCZ Z-Drive p84 is plugged into a
PCI-Express x8 lane.
Here is my test script:
#!/bin/bash
BS=$((1024))
COUNT=$((1024*1024*10))
for i in 1 4 16 64 256 512 1024 2048 4096 8192 16384 32768 65536; do
bs=$((BS * i))
count=$((COUNT / i))
echo bs=$bs count=$count
sudo mount /dev/sdb1 /media/test
dd if=/dev/zero of=/media/test/foo bs=$bs count=$count
sudo umount /media/test
sleep 1
sudo mount /dev/sdb1 /media/test
dd if=/media/test/foo of=/dev/null bs=$bs count=$count
rm /media/test/foo
sudo umount /media/test
done
This script assumes the Z-drive is /dev/sdb1 and it is mounted on /media/test.
Best regards,
Ryousei
On Mon, Nov 30, 2009 at 10:25 PM, Desai, Kashyap <Kashyap.Desai@xxxxxxx> wrote:
> Ryousei,
>
> Replied inlined.
>
> Thanks,
> Kashyap
>
>
>> -----Original Message-----
>> From: Ryousei Takano [mailto:ryousei@xxxxxxxxx]
>> Sent: Monday, November 30, 2009 3:08 PM
>> To: Moore, Eric
>> Cc: linux-scsi@xxxxxxxxxxxxxxx; DL-MPT Fusion Linux; Support, Software;
>> takano-ryousei@xxxxxxxxxx
>> Subject: OCZ Z-drive p84 read performance
>>
>> Dear Eric Moore and all,
>>
>> I am installing ubuntu 9.10 (kernel 2.6.31-14-server) on my PC, which
>> has OCZ Z-Drive p84.
>> This drive consists of LSI logic's SAS1068E controller and 4 MLC SSDs.
>> I am using mptsas driver instead of the official binary driver
>> (megasar).
> Is this megaraid driver or mpt fusion?
> Driver version?
>
> I ran simple read & write
>> benchmark using dd(1). The result shows the throughput of sequential
>> read achieves 260 MB/s,
>> which is the half of sequential write performance (520 MB/s):
> Setup information?
>>
>> block size write (MB/s) read (MB/s)
>> 1024 201 241
>> 4096 472 262
>> 16384 486 267
>> 65536 502 266
>> 262144 472 259
>> 524288 525 251
>> 1048576 528 245
>> 2097152 517 253
>> 4194304 433 247
>> 8388608 406 246
>> 16777216 405 243
>> 33554432 405 242
>> 67108864 405 242
>>
>> I wonder why read performance is worse than write performance.
>> What is the bottleneck of read performance?
>>
>> For more information, please see my page:
>> http://code.google.com/p/pspacer/wiki/ZdrivePerformance
>>
>> Any comments and suggestions will be welcome.
>>
>> Best regards,
>> Ryousei
>
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